Abstract

One method to enhance the light out-coupling efficiency of organic light emitting diodes (OLEDs) by incorporating microlens arrays (MLAs) is demonstrated. The MLAs made of prepolymer NOA65 were fabricated on the substrate pre-patterned by microcontact printing of hydrophobic self-assembled monolayers (SAMs). Due to the hydrophobic effect, the lens material was self-organized on the hydrophilic regions. After assembling the MLA onto the OLED, the optical measurement showed that the light out-coupling efficiency of an OLED with MLAs is improved without any apparent color-shift.

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